CAJ | 학술논문

本文建立了离子液体协同增敏浊点萃取-紫外可见分光光度法测定痕量镉的方法。离子液体和二硫代氨基甲酸钠（ DDTC）分别用作增敏剂和络合剂，离子液体的加入能使测定镉的方法灵敏度提高3.2倍。非离子表面活性剂TritonX-100用作提取剂，当样品体系的温度高于TritonX-100的浊点温度时，镉与DDCT形成的络合物被萃取到TritonX-100中，经相分离紫外可见分光光度计检测。考查了离子液体，DDTC和TritonX-100的浓度、溶液酸度、干扰离子等实验条件对浊点萃取效率的影响。在最优化的实验条件下，测量镉的线性范围为1～100 ng· mL-1，方法的检出限为0.1 ng· mL-1，相对标准偏差RSD为4.3％，富集系数为96。该方法应用于测定于水样中的痕量镉具有满意的效果。
본문건립료리자액체협동증민탁점췌취-자외가견분광광도법측정흔량력적방법。리자액체화이류대안기갑산납（ DDTC）분별용작증민제화락합제，리자액체적가입능사측정력적방법령민도제고3.2배。비리자표면활성제TritonX-100용작제취제，당양품체계적온도고우TritonX-100적탁점온도시，력여DDCT형성적락합물피췌취도TritonX-100중，경상분리자외가견분광광도계검측。고사료리자액체，DDTC화TritonX-100적농도、용액산도、간우리자등실험조건대탁점췌취효솔적영향。재최우화적실험조건하，측량력적선성범위위1～100 ng· mL-1，방법적검출한위0.1 ng· mL-1，상대표준편차RSD위4.3％，부집계수위96。해방법응용우측정우수양중적흔량력구유만의적효과。
A new method based on enhancement effect of room temperature ionic liquids for cloud point extraction trace amounts of cadmium combined with UV-vis spectrophotometric determination was developed.Room temperature ionic liquids(RTILs)and dieth-yldithiocarbamate(DDTC)were used enhancement agent and chelating agent ,respectively.The addition of room temperature ionic liquids leads to 3.2 times improvement in the determination of cadmium.The nonionic surfactant Triton X-100 was used as the ex-tractant.When the temperature of the system was higher than the cloud point of Triton X-100,Cd-DDTC complex was extracted into Triton X-100 and separation of the analyte from the matrix was achieved.Some parameters that influenced cloud point extraction and subsequent determination were evaluated in detail ,such as the concentrations of RTILs ,DDTC and Triton X-100;pH of sample solu-tion,as well as interferences.Under optimized conditions , an enrichment factor of 96 could be obtained , and the detection limit ( LOD) for Cd was 0.1 ng· mL-1 .Relative standard deviations for five replicate determinations of the standard solution containing 50 ng· mL-1 Cd was 4.3%.The proposed method was successfully applied to the determination of cadmium in certified reference mate -rials with satisfactory results .